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Genome-wide analysis of Hanwoo and Chikso populations using the BovineSNP50 genotyping array
Jun-Seok Song1, Ha-Seung Seong1, Bong-Hwan Choi2
1College of Animal Life Science, Kangwon National University, Chuncheon, 24341, Republic of Korea.
Genes & Genomics
|September 1, 2018
Summary
Genomic analysis of Korean native cattle reveals low genetic differentiation between Hanwoo and Chikso breeds. Despite distinct clusters, both populations show minimal inbreeding and share potential selection signatures for important traits.
Area of Science:
- Genomics
- Animal Genetics
- Population Genetics
Background:
- Hanwoo and Chikso are recognized Korean native cattle breeds.
- Limited genomic studies exist comparing these two populations.
- Understanding their genetic relationship is crucial for conservation and breeding.
Purpose of the Study:
- To conduct a genome-wide analysis comparing Hanwoo and Chikso cattle.
- To investigate the genetic relationships and population structure between these breeds.
- To identify potential genetic markers associated with important traits.
Main Methods:
- Genotyping of 319 cattle (214 Hanwoo, 105 Chikso) using Illumina Bovine SNP50K Beadchip.
- Quality control and linkage disequilibrium (LD) analysis of single nucleotide polymorphism (SNP) pairs.
- Principal Component Analysis (PCA) and calculation of heterozygosity, inbreeding coefficients, and FST values.
Main Results:
- Average r² values were lower in Hanwoo (0.048) than Chikso (0.074).
- PCA showed distinct clusters for Hanwoo and Chikso, but an average FST of 0.036 indicated low genetic differentiation.
- Hanwoo exhibited slightly higher heterozygosity (0.359 vs. 0.345) and inbreeding coefficient (-0.015 vs. -0.035) than Chikso.
Conclusions:
- Hanwoo and Chikso cattle populations exhibit low genetic differentiation.
- Both breeds appear to not be under severe inbreeding.
- Identified potential selection signatures in genes like LRP1B and NTRK2, possibly related to meat and reproductive traits.
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